<!--
  Copyright (c) 2006-2013, JGraph Ltd
  
  Hello, World! example for mxGraph. This example demonstrates using
  a DOM node to create a graph and adding vertices and edges.
-->
<html>
<head>
	<title>Hello, World! example for mxGraph</title>

	<!-- Sets the basepath for the library if not in same directory -->
	<script type="text/javascript">
		mxBasePath = '../src';
	</script>

	<!-- Loads and initializes the library -->
	<script type="text/javascript" src="../src/js/mxClient.js"></script>

	<!-- Example code -->
	<script type="text/javascript">
		// Program starts here. Creates a sample graph in the
		// DOM node with the specified ID. This function is invoked
		// from the onLoad event handler of the document (see below).
		function main(container)
		{
			// Checks if the browser is supported
			if (!mxClient.isBrowserSupported())
			{
				// Displays an error message if the browser is not supported.
				mxUtils.error('Browser is not supported!', 200, false);
			}
			else
			{
				// Creates the graph inside the given container
				var graph = new mxGraph(container);

				// Enables rubberband selection
				new mxRubberband(graph);
				
				// Gets the default parent for inserting new cells. This
				// is normally the first child of the root (ie. layer 0).
				var parent = graph.getDefaultParent();
								
				// Adds cells to the model in a single step
				graph.getModel().beginUpdate();
				try
				{
					var v1 = graph.insertVertex(parent, null, 'Hello,', 20, 20, 80, 30);
					var v2 = graph.insertVertex(parent, null, 'World!', 200, 150, 80, 30);
					var e1 = graph.insertEdge(parent, null, '', v1, v2);
				}
				finally
				{
					// Updates the display
					graph.getModel().endUpdate();
				}
				
				var cellEditorInit = graph.cellEditor.init;
				
				graph.cellEditor.init = function()
				{
					cellEditorInit.apply(this, arguments);

					this.textarea.onselect = mxUtils.bind(this, function()
					{
						mxLog.show();
						mxLog.debug('selected', get_selection(this.textarea).text);
					});
				};
			}
		};
		
		// See http://stackoverflow.com/questions/401593/understanding-what-goes-on-with-textarea-selection-with-javascript
		function get_selection(e)
		{
		    //Mozilla and DOM 3.0
		    if('selectionStart' in e)
		    {
		        var l = e.selectionEnd - e.selectionStart;
		        return { start: e.selectionStart, end: e.selectionEnd, length: l, text: e.value.substr(e.selectionStart, l) };
		    }
		    //IE
		    else if(document.selection)
		    {
		        e.focus();
		        var r = document.selection.createRange();
		        var tr = e.createTextRange();
		        var tr2 = tr.duplicate();
		        tr2.moveToBookmark(r.getBookmark());
		        tr.setEndPoint('EndToStart',tr2);
		        if (r == null || tr == null) return { start: e.value.length, end: e.value.length, length: 0, text: '' };
		        var text_part = r.text.replace(/[\r\n]/g,'.'); //for some reason IE doesn't always count the \n and \r in the length
		        var text_whole = e.value.replace(/[\r\n]/g,'.');
		        var the_start = text_whole.indexOf(text_part,tr.text.length);
		        return { start: the_start, end: the_start + text_part.length, length: text_part.length, text: r.text };
		    }
		    //Browser not supported
		    else return { start: e.value.length, end: e.value.length, length: 0, text: '' };
		}
		
	</script>
</head>

<!-- Page passes the container for the graph to the program -->
<body onload="main(document.getElementById('graphContainer'))">

	<!-- Creates a container for the graph with a grid wallpaper -->
	<div id="graphContainer"
		style="position:relative;overflow:hidden;width:321px;height:241px;background:url('editors/images/grid.gif');cursor:default;">
	</div>
</body>
</html>
